How to use JS objects in a Perchance generator?

Can you share a minimal example of what you've tried?

I think you might be running into the issue where you need to wrap your object in parentheses, like this? foo = [({abc:123})] See the meta:tags lines in https://perchance.org/t2i-styles#edit for an example.

You only need to do that if you're creating an object within square brackets without assigning it to a variable within those brackets. E.g. you can just write [foo={abc:123}] since the equals sign forces the JavaScript engine to interpret it as an object.

The reason for this weirdness is technical - related to how JavaScript engines evaluate stuff. Basically, {abc:123} on its own (without parentheses or variable assignment) is interpreted as a block scope with a label.